CVE-2025-21725

smb: client: fix oops due to unset link speed

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix oops due to unset link speed It isn't guaranteed that NETWORK_INTERFACE_INFO::LinkSpeed will always
be set by the server, so the client must handle any values and then
prevent oopses like below from happening: Oops: divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1323 Comm: cat Not tainted 6.13.0-rc7 #2
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-3.fc41
04/01/2014
RIP: 0010:cifs_debug_data_proc_show+0xa45/0x1460 [cifs] Code: 00 00 48
89 df e8 3b cd 1b c1 41 f6 44 24 2c 04 0f 84 50 01 00 00 48 89 ef e8
e7 d0 1b c1 49 8b 44 24 18 31 d2 49 8d 7c 24 28 <48> f7 74 24 18 48 89
c3 e8 6e cf 1b c1 41 8b 6c 24 28 49 8d 7c 24
RSP: 0018:ffffc90001817be0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88811230022c RCX: ffffffffc041bd99
RDX: 0000000000000000 RSI: 0000000000000567 RDI: ffff888112300228
RBP: ffff888112300218 R08: fffff52000302f5f R09: ffffed1022fa58ac
R10: ffff888117d2c566 R11: 00000000fffffffe R12: ffff888112300200
R13: 000000012a15343f R14: 0000000000000001 R15: ffff888113f2db58
FS: 00007fe27119e740(0000) GS:ffff888148600000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe2633c5000 CR3: 0000000124da0000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace: <TASK> ? __die_body.cold+0x19/0x27 ? die+0x2e/0x50 ? do_trap+0x159/0x1b0 ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] ? do_error_trap+0x90/0x130 ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] ? exc_divide_error+0x39/0x50 ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] ? asm_exc_divide_error+0x1a/0x20 ? cifs_debug_data_proc_show+0xa39/0x1460 [cifs] ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] ? seq_read_iter+0x42e/0x790 seq_read_iter+0x19a/0x790 proc_reg_read_iter+0xbe/0x110 ? __pfx_proc_reg_read_iter+0x10/0x10 vfs_read+0x469/0x570 ? do_user_addr_fault+0x398/0x760 ? __pfx_vfs_read+0x10/0x10 ? find_held_lock+0x8a/0xa0 ? __pfx_lock_release+0x10/0x10 ksys_read+0xd3/0x170 ? __pfx_ksys_read+0x10/0x10 ? __rcu_read_unlock+0x50/0x270 ? mark_held_locks+0x1a/0x90 do_syscall_64+0xbb/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe271288911
Code: 00 48 8b 15 01 25 10 00 f7 d8 64 89 02 b8 ff ff ff ff eb bd e8
20 ad 01 00 f3 0f 1e fa 80 3d b5 a7 10 00 00 74 13 31 c0 0f 05 <48> 3d
00 f0 ff ff 77 4f c3 66 0f 1f 44 00 00 55 48 89 e5 48 83 ec
RSP: 002b:00007ffe87c079d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000040000 RCX: 00007fe271288911
RDX: 0000000000040000 RSI: 00007fe2633c6000 RDI: 0000000000000003
RBP: 00007ffe87c07a00 R08: 0000000000000000 R09: 00007fe2713e6380
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000040000
R13: 00007fe2633c6000 R14: 0000000000000003 R15: 0000000000000000 </TASK> Fix this by setting cifs_server_iface::speed to a sane value (1Gbps)
by default when link speed is unset.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2024-12-29 CVE Reserved
2025-02-27 CVE Published
2025-02-27 CVE Updated
2025-02-27 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (8)

URL	Tag	Source
https://git.kernel.org/stable/c/548893404c44fc01a59f17727876e02553146fe6	Vuln. Introduced
https://git.kernel.org/stable/c/1cd8c353708de99d8bfa7db8a0c961a800b1fa7f	Vuln. Introduced
https://git.kernel.org/stable/c/a6d8fb54a515f0546ffdb7870102b1238917e567	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/208e102a2fca44e40a6c3f7b9e2609cfd17a15aa	2025-02-21
https://git.kernel.org/stable/c/3f901c35e1a1b3ed1b528a17ffdb941aa0294458	2025-02-08
https://git.kernel.org/stable/c/699179dfc8d7da457b152ca5d18ae45f9ed9beaa	2025-02-08
https://git.kernel.org/stable/c/ad3b49fbdb156aa8ee2026ba590642c9b5a410f2	2025-02-08
https://git.kernel.org/stable/c/be7a6a77669588bfa5022a470989702bbbb11e7f	2025-01-20

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.1.65 < 6.1.129 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1.65 < 6.1.129"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.6.4 < 6.6.76 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6.4 < 6.6.76"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.7 < 6.12.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.7 < 6.12.13"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.7 < 6.13.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.7 < 6.13.2"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.7 < 6.14-rc1 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.7 < 6.14-rc1"		en		Affected